Steam and air engine



(N0.Model.) 'sneets-sneen 1.

F. MGMELLON.

STEAM AND AIR/ENGINE.

No. 273.376 Patented Mal-.6, 1883.

(No Model.) 2 Sheets-Sheet 2.

F. MOMELLON.

I STEAM AND AIR ENGINE. No. 273,376. I Patented 1V[ r;.6,1883'.

n Q "'"f Jug N. PETERS, Mdu h, wllh'llnblh a c.

UNITED STATES PATENT OFFICE,

FREDERICK MGMELLON, OF BOSTON, ASSIGNOR OF ONE-THIRD TO ROBERT G.PARKER, OF MANSFIELD, MASSACHUSETTS.

ST-EAM,AND AIR ENGINE.

SPECIFICATION forming part of Letters Patent No. 273,376, dated March 6,1883.

Application filed October 11, 1882. (N model.)

To all whom it may concern: 7

Be it known that I, FREDERICK MoMEL- LON, of Boston, in the county ofSuffolk, State of Massachusetts, have invented acertain new and usefulImprovement in Steam and Air Engines,'of which the following is adescription, sufficiently full, clear, and exact to enable any personskilled in the art or science to which said invention appertains to makeand m use the same, reference being had to the accompanying drawings,forming a part of this specification, in which- Figure 1 is a side, andFig. 2 an end, elevation. I 5 Like letters of reference indicatecorresponding parts in the different figures of the drawings.

My invention relates to that class of steamengines in vwhich air is usedas an auxiliary motor; and it consists in a novel construction andarrangement of the parts, as hereinafter more fully set forth andclaimed, by which a new and more effective device of this character isproduced than is now in ordinary use. In the drawings, A represents theboiler; B,

the cylinder; ,0, the balance or driving wheel; D, the pitman; E, thesteam-pipe, connecting the boiler and engine; andG, the cut-off. Asthese parts, with their necessary connecting and operative mechanism,constitute the ordinary steam-engine, it is not deemed essential to givea more explicit description of the same.

Disposed on the shaft H of the wheel 0 there is a gear, I, whichintermeshes with the gear J, mounted on the horizontal shaft K,supported in the vertical standards or hearings to a, and at the outerend of the shaft K there is a face-plate, L, provided with the crankpin01. A pump, M, provided with the vertical piston-rod O, is mounted 011the upright framework N, the piston being connected with the pin (1 bymeans of the pitman-rod P. The pump is provided with an induction-pipe,Q, an education-pipe, R, and proper valves (not shown) to constitute iteither an air or water pump, as occasion may require. The pipe R leadsdirectly from the pump to the boiler A, entering the same above thecrown-sheet, and is provided with a branch pipe, S, and relief orescapevalve m.

The pipe Q is provided, with the T-pipe U, connecting with a water-tank,(not shown,) airvalve o, and stop-cock w. I 5 5 From the foregoingdescription it willbe understood that the pump M is designed to forceeither air or water into the boiler A, as desired. 7

Then the pump is used for air the stopcock at is closed to prevent theentrance of water, the air entering the lower part of the pump, beneaththe piston, through the valve 1), and the upper part of the pump, abovethe piston, through a valve, the stem of which is 6 seen at Y, beingforced by the pump into the boiler through the pipe R. When the pumpis'used for water the valve 50 is opened and the valves 1: closed, thewater beingalso forced into the boiler through the pipe'R. A checkvalve,w, prevents a reverse flow of either air or water through the pipe Q, onthe downward stroke of the pump-piston, and the pressureor escape valvem is designed to be so regulated as to discharge water when the pressurehe comes too great in the boiler, or when it is full. Air forced intothe boiler, as described, is immediately expanded, by the heat, and,passing through the pipe E, acts as a powerful auxiliary to the steam inrunning the engine. It also maintains its pressure much longer than thesteam, thereby enabling the engine to be started up after the steam isdown. Having thus explained my improvement, what I claim is 8 In adevice substantially such as described, the combination of the followinginstrumentalities, to wit: a boiler for generating steam, a pump adaptedto force either air or water into the boiler, and an engine foroperating the e pump, the engine beingconnected to the pump bysuitableoperat-ive mechanism, and to the boiler by an inductionsteam-pipe, and the pump connected to the boiler by the pipe providedwith the branch S, having an automatic 5 relief or escape ,valve, or,substantially as shown and described.

FREDERIGIQ RICMELLON.

Witnesses I G. A. SHAw, JAMES M. PALMER.

